Monitoring plastic pollution with artificial intelligence
As part of their work to understand the sources, sinks and transport dynamics of plastic pollution from land to the ocean, CSIRO’s Marine Debris team has developed machine learning and computer vision models to monitor the flux and abundance of litter in rivers and stormwater drains.
The power of AI
Machine learning and computer vision are subsets of artificial intelligence (AI) that allow computers to understand the content of digital images.
With cameras placed under bridges or on poles near waterways, we are able to detect and classify litter items that are floating on the surface. We can infer their abundance and distribution and inform waste managers and policy makers in their efforts to identify litter hotspots and develop safe, smart and less expensive waste management systems.
Our dataset currently comprises of more than a million images from rivers and stormwater drains in Australia, the United Kingdom, Sri Lanka, Bangladesh and Brazil.
Chris Wilcox setting up a trail camera to monitor litter flux over a waterway in Hobart.
From the images collected, we have labelled thousands of items across more than 30 categories and created a dataset that is unique in scope and size.
Litter comes in many different colours, shapes and sizes. To retain flexibility to monitor different river settings and maximise the transferability of our models to new locations, we have developed two different workflows to detect and identify litter items.
One workflow consists of a single object detection model, where all categories of litter are represented. The other consists of an object detection model followed by a classification model. These workflows are being optimised for IoT devices and will allow us to obtain litter counts in near-real time.